16．John is as good as his word．         he makes a promise，he will keep it．（　�。�
A．BeforeB．WhileC．AlthoughD．Once

分析 約翰是個(gè)言而有信的人．一旦他做出了承諾，他就會(huì)堅(jiān)持．

解答 答案D．
before"在…之前"，引導(dǎo)時(shí)間狀語(yǔ)從句．while表示"當(dāng)…的時(shí)候"，引導(dǎo)時(shí)間狀語(yǔ)從句；意為"盡管、雖然"，引導(dǎo)讓步狀語(yǔ)從句；意為"而、但是"，引導(dǎo)比較狀語(yǔ)從句．a(chǎn)lthough"盡管，雖然"，引導(dǎo)讓步狀語(yǔ)從句．once"一旦"，引導(dǎo)時(shí)間狀語(yǔ)從句．"he makes a promise"和"he will keep it"之間是邏輯上的"時(shí)間"關(guān)系，可排除C項(xiàng)；再聯(lián)系句子所表達(dá)的意思可知A和B意思不通順，故答案選D．

點(diǎn)評(píng) 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關(guān)系，再確定相應(yīng)的連詞，同時(shí)注意不同的連詞的語(yǔ)義及用法區(qū)別．

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